05000366/LER-1983-016-03, /03L-0:on 830405,MSIV Drain Valve 2B21-F016 Would Not Close.Caused by Dirty Torque Switch Contacts.Contacts Disconnected,Cleaned & Retightened.Valve Cycled Properly

/03L-0:on 830405,MSIV Drain Valve 2B21-F016 Would Not Close.Caused by Dirty Torque Switch Contacts.Contacts Disconnected,Cleaned & Retightened.Valve Cycled Properly

ML20023C634
Person / Time
Site:	Hatch
Issue date:	05/05/1983
From:	Sumner H GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023C614	List: 05000366/LER-1983-016, Forwards LER 83-016/03L-0 05000366/LER-1983-016-03, /03L-0:on 830405,MSIV Drain Valve 2B21-F016 Would Not Close.Caused by Dirty Torque Switch Contacts.Contacts Disconnected,Cleaned & Retightened.Valve Cycled Properly
References
LER-83-016-03L-01, LER-83-16-3L-1, NUDOCS 8305170499
Download: ML20023C634 (3)

LER-1983-016, /03L-0:on 830405,MSIV Drain Valve 2B21-F016 Would Not Close.Caused by Dirty Torque Switch Contacts.Contacts Disconnected,Cleaned & Retightened.Valve Cycled Properly

Event date:
Report date:
3661983016R03 - NRC Website

text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 ti DOCKET NUMBER 68 69 EVENT DATE 74 76 REPORT DATE 80 m l HNP-2-3109 "MSIV DRAIN VALVE LSFT" h EVENT DESCRIPTloN AND FRoBABLE CONSEQUENCES procedure was in progress. Logic was l

initiated to close drain valve 2821-F016. Indicator lamps on the con-l Io iai I

,,,,, ; trol panel 2Hll-P602 gave a double indication. It was determined that l

valve 2B21-F016 would not close and, therefore, would not meet the re-

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l O l6 l l Quirements of Tech. Specs. Section 3.6.3.2. The valve was placed in the

o,,i l open position and the test terminated. The health and safety of the g

public were not affected by this non-repetitive event.

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,,,o,l The valve would not close because of dirty contacts on the torque j

swJtch. The contacts were disconnected, cleaned, and re-tightened.

The

,,,,jg valve was then cycled properly by using its control switch.

The logic system functional test HNP-2-3016 was resumed and completed

,,,3, successfully.

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NAME OF PREPARER PHONE:

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NARRATIVE

REPORT FOR LER 50-366/1983-016 LICENSEE

GEORGIA POWER COMPANY FACILITY NAME

EDWIN I.

HATCH DOCKET NUMBER

50-366' Tech. Specs. section(s) which requires report:

This 30 day LER is required by Tech. Specs. Section 6.9.1.9.b due to the event's showing that tne unit was not meeting the requirements of Unit 2 Tech. Specs. Section 4.6.3.2.

Plant conditions at the time of the event (s):

This event occurred on 4-5-83 with the unit shutdown for refueling.

Detailed description of the event (s):

On 4-5-83 (reference Deviation Report Number 2-83-48) and again on 4-11-83 (reference Deviation Report Number 2-83-53), with LSFT HNP-2-3109

" MAIN STEAM DRAIN VALVES" in progress, orain valve 2B21-F016 failed to cycle fully upon logic signal.

With the valve in the open position, logic was initiated to close the valve.

Upon initiation the valve began to close and stuck in the partially open/ closed position.

Double indication was observed on control panel 2Hll-P602.

The LSFT was terminated and the valve placed in the open position.

Consequences of the event (s):

Plant was shutcown at the time of the event; therefore, there were no significant consequences of this event.

The health and safety of the public were not affected by this event.

't Status of redundant or backup subsystems and/or systems:

Plant was shutdown at the time of the event, no backup system required.

Justification for continued operation:

Plant was shutdown at the time of the event.

Valve has been fixed and functionally tested.

If repetitive, nuraber of previous LER:

This is a non-repetitive event.

Impact to other systems and/or Unit:

This event had no effect on any other systems or on the other Unit.

Cause(s) of the event (s):

The cause of the event was dirty contacts on the torque switch preventing continuous signal and travel of the valve.

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NARRATIVE' REPORT FOR LER 50-366/1983-016

'Page Two

' Immediate Corrective Action:

The contacts on the torque switch were disconnecteo, cleaned and re-tightened.

The valve was then cycleo using the control switch.

The LSFT was successfully completed and the _ system returneo to service on 4-12-83.

Supplemental Corrective Action:

No supplemental corrective action is required.

Scheduled (future) corrective action:

No scheduled (future) corrective action is required.

Action to prevent recurrence (if different from corrective actions):

The corrective actions taken should be sufficient to preclude recurrence.